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17.1 (SLM) Screen Display Areas
The main area shows “frequency”, “level” and “wideband”
measurements as follows:
“Frequency”: is the centre frequency(s) the instrument
has been set to measure. This is either the generator
frequency, input frequency, single or dual frequencies.
“Level” is the rms voltage and dBm signal level seen over
the measurement frequency “bandwidth”, referenced to
the “centre frequency”.
“Wideband” is the rms voltage signal level across the
entire frequency range (5Hz to 5MHz) of the instrument.
This is useful for determining if there are any other signals
present or noise.
The other areas are:
„GENERATOR‟ area: Displays the generator frequency,
the output level and if the output is set to „low‟, „high‟ or
“off”.
Note: The output level of the generator when connected
to one of the inputs may differ to the measurement
reading on the SLM display. This is apparent when the
load isn‟t equal to the generator impedance setting.
„INPUT‟ area: Displays the input channel selected. When
the INPUT displays anything but „high‟ it is in the
„terminate‟ mode. The inputs available are, high Z, 50Ω
18 W, low level and balanced.
„MEASURE‟ area: Displays its impedance reference, the
frequency bandwidth and the centre frequency control
settings. Although the input impedance may be set to
high, the dBm reading must be referenced to an
impedance value, normally 50Ω for carrier applications.
However, some utilities still use 600Ω.
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SLM3505 User Manual